I applied through a staffing agency. The process took 1 week. I interviewed at Jane Street in Nov 2015
Interview
First stage involved a fairly simple Excel competency test, which I was given a few days to complete. This did not require any advanced knowledge or VBA, just an attention to detail. Second stage was a phone interview with someone from HR and consisted of a brief description of the role and then maths/probability brainteasers. Third stage was another interview, this time with a trader and the questions were harder. I couldn't do one of the problems and didn't know how to answer those relating to my confidence in the answer I had given. Both interviewers were welcoming and answered my questions however the quality of the signal on their end wasn't great, so make sure your phone has a decent speaker.
2 round online interviews. first round is leetcode, 2nd round is online 1to1 zoom interview, asked me brain teaser questions only, did not discuss cv. i f up on quite easy questions. shame on me.
I applied through a recruiter. I interviewed at Jane Street in Dec 2025
Interview
Only did the mathematical problem solving interview. No advanced technical knowledge required. Focused mainly on creativity within arithmetic and statistics questions. Focus more on showing your thought process than just solving the question since the interviewer is happy to help if needed.
Interview questions [1]
Question 1
A train arrives at the station every 20 minutes. If you take 5 minutes to run and 10 minutes to walk, what is the expected wait time at the station?
I applied through a recruiter. I interviewed at Jane Street (London, England) in Feb 2026
Interview
Applied through a referral. The first step was an initial HackerRank-style assessment that was pretty straightforward and mostly Excel/data-analysis type work. I had to look up values, calculate metrics like profit, and answer practical business/math questions.
The second round was with a TDOE and was much more intense. It focused on live problem solving, analytical reasoning, and probability/math concepts. I would recommend being comfortable with expected value, expected wait times, conditional probability, basic optimization, and explaining tradeoffs clearly. The interviewer cared a lot about how I broke down the problem, not just the final answer.
Interview questions [1]
Question 1
One question involved expected wait times for a train that runs every 10 minutes, compared with walking. The train took 5 minutes and walking took 10 minutes. The interviewer kept adding new factors and asked whether the expected wait time or overall travel time would increase or decrease, and why. It was very interactive.